2. A very diminutive person; a dwarf. Elf arrow, a flint arrowhead; so called by the englishrural folk who often find these objects of prehistoric make in the fields and formerly attributed them to fairies; called also elf bolt, elfdart, and elfshot. Elfchild, a child supposed to be left by elves, in room of one they had stolen. See Changeling. Elf fire, the ignis fatuus.